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By "Baldwin, Mark."
Soil survey of the middle Gila Valley area, Arizona / by E.C. Eckmann, Mark Baldwin, and E.J. Carpenter.
By: Eckmann, E. C. - Baldwin, Mark. - Carpenter, E. J. - United States. - United States.
Publication info: Washington :Govt. Print. Office,1920.
Contributed by: University of California Libraries (archive.org)